they look like laithi mags converted for the mosin, like Mg 13 mags converted for G-43's or M-76
there is a guy over on ak files doing this conversion for PSL's same mag
could be wrong could be newly made but thats what they look

“The very atmosphere of firearms anywhere and everywhere restrains evil interference- they deserve a place of honor with all that is good.”George Washington

"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." George Washington